I. How long is the lifespan of solar panels?
Tempered glass laminated solar panels have a lifespan of 25 years, PET laminated solar panels have a lifespan of 5-8 years, and epoxy resin encapsulated solar panels have a lifespan of 2-3 years. Currently, over 95% of solar panels on the market are tempered glass laminated.
The lifespan of a photovoltaic module is determined by its power generation efficiency. The degree of bonding of the PN junction and the purity of the silicon wafer determine the intensity of electrical energy generated by the solar panel under the same light irradiation. Over time, the PN junction will break down, and the efficiency will continue to decline. After 15 years, the conversion efficiency will be over 90%, and after 25 years it will drop to about 85%. Therefore, the lifespan of a photovoltaic module is basically over 20 years.
The main influencing factors are as follows:
1. Hot spot effect
The hot spot effect refers to the phenomenon where, during a normal operation of a battery module, a single cell is covered by a small object at a certain moment. This reduces the current generated by that single cell. A single cell in a battery module can be considered as a PN junction structure similar to a diode, exhibiting reverse avalanche breakdown. According to Kirchhoff's current and voltage laws, when the current generated by the covered cell is less than the circuit current, that cell becomes negatively charged, acting as a load. It then dissipates the energy generated by other cells as heat.
The hot spot effect is also closely related to the manufacturing process of battery modules. Due to defects in manufacturing processes, uneven internal resistance often occurs in individual battery cells. Cells with uneven internal resistance are highly susceptible to hot spot phenomena.
Hot spot effects are extremely harmful to solar cells. At best, they can burn out the individual cells; at worst, they can cause the entire solar module to burn.
2. Impact of environmental factors
Temperature, light radiation intensity, wind load, and snow and ice load can also affect battery life.
II. Differences between solar cell modules and solar panels
Solar cell module: refers to the silicon wafers assembled from solar cells. Solar cell: includes the entire component of a solar module. A solar cell module consists of high-efficiency crystalline silicon solar cells, ultra-white tempered glass, EVA, transparent TPT backsheet, and aluminum alloy frame. It has a long lifespan and is subjected to high mechanical pressure and external forces. A single solar cell cannot be used directly as a power source. As a power source, several cells must be connected in series or parallel and tightly sealed within the module. A solar module (also known as a solar panel or photovoltaic module) is the core component of a solar power generation system and an important part of it. Its function is to convert solar energy into electrical energy, either for storage in batteries or to power loads.
The quality and cost of solar modules directly determine the quality and cost of the entire system. Solar cells, also known as "solar chips" or "photovoltaic cells," are photovoltaic semiconductor wafers that directly generate electricity using solar light. As long as they are illuminated, they can output voltage instantaneously and generate current when a circuit is present. Photovoltaics (PV) is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. Thin-film solar cells using the photoelectric effect are the mainstream, while solar cells using the photochemical effect are still in their early stages. Data shows that China's solar cell production continues to maintain its advantages in production and cost-effectiveness, and its international competitiveness continues to increase. Production continues to rise. It is estimated that China's solar cell production capacity will exceed 40GW, and its output will exceed 24GW, still accounting for half of the global share.
With the continuous development of the solar cell industry, competition within the domestic sector is becoming increasingly fierce. Integration with capital operations is becoming more frequent among large solar cell companies. Leading domestic solar cell manufacturers are placing greater emphasis on market research, particularly in-depth analysis of the industry's development environment and product buyers. Consequently, a large number of excellent domestic solar cell brands have rapidly emerged and are gradually becoming leaders in the solar cell industry.
The above is the content related to "solar cells" brought to you by this editor. Through this article, we hope that everyone will have a certain understanding of the lifespan of solar cells and the differences between solar cell modules and solar cell components.
